bcm53xx: add bcm53xxspiflash driver for SPI flashes

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

SVN-Revision: 42260

1 files changed, 263 insertions, 0 deletions

diff --git a/target/linux/bcm53xx/patches-3.14/404-mtd-bcm53xxspiflash-new-driver-for-SPI-flahes-on-Bro.patch b/target/linux/bcm53xx/patches-3.14/404-mtd-bcm53xxspiflash-new-driver-for-SPI-flahes-on-Bro.patch
new file mode 100644
index 0000000..9a9d903
--- /dev/null
+++ b/target/linux/bcm53xx/patches-3.14/404-mtd-bcm53xxspiflash-new-driver-for-SPI-flahes-on-Bro.patch
@@ -0,0 +1,263 @@
+--- a/drivers/mtd/spi-nor/Kconfig
++++ b/drivers/mtd/spi-nor/Kconfig
+@@ -28,4 +28,10 @@ config SPI_FSL_QUADSPI
+ 	  This enables support for the Quad SPI controller in master mode.
+ 	  We only connect the NOR to this controller now.
+ 
++config MTD_SPI_BCM53XXSPIFLASH
++	tristate "SPI-NOR flashes connected to the Broadcom ARM SoC"
++	depends on MTD_SPI_NOR
++	help
++	  SPI driver for flashes used on Broadcom ARM SoCs.
++
+ endif # MTD_SPI_NOR
+--- a/drivers/mtd/spi-nor/Makefile
++++ b/drivers/mtd/spi-nor/Makefile
+@@ -1,2 +1,3 @@
+ obj-$(CONFIG_MTD_SPI_NOR)	+= spi-nor.o
+ obj-$(CONFIG_SPI_FSL_QUADSPI)	+= fsl-quadspi.o
++obj-$(CONFIG_MTD_SPI_BCM53XXSPIFLASH)	+= bcm53xxspiflash.o
+--- /dev/null
++++ b/drivers/mtd/spi-nor/bcm53xxspiflash.c
+@@ -0,0 +1,241 @@
++#include <linux/module.h>
++#include <linux/delay.h>
++#include <linux/spi/spi.h>
++#include <linux/mtd/spi-nor.h>
++#include <linux/mtd/mtd.h>
++#include <linux/mtd/cfi.h>
++
++static const char * const probes[] = { "bcm47xxpart", NULL };
++
++struct bcm53xxsf {
++	struct spi_device *spi;
++	struct mtd_info mtd;
++	struct spi_nor nor;
++};
++
++/**************************************************
++ * spi-nor API
++ **************************************************/
++
++static int bcm53xxspiflash_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
++				   int len)
++{
++	struct bcm53xxsf *b53sf = nor->priv;
++
++	return spi_write_then_read(b53sf->spi, &opcode, 1, buf, len);
++}
++
++static int bcm53xxspiflash_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
++				     int len, int write_enable)
++{
++	struct bcm53xxsf *b53sf = nor->priv;
++	u8 *cmd = kzalloc(len + 1, GFP_KERNEL);
++	int err;
++
++	if (!cmd)
++		return -ENOMEM;
++
++	cmd[0] = opcode;
++	memcpy(&cmd[1], buf, len);
++	err = spi_write(b53sf->spi, cmd, len + 1);
++
++	kfree(cmd);
++
++	return err;
++}
++
++static int bcm53xxspiflash_read(struct spi_nor *nor, loff_t from, size_t len,
++				size_t *retlen, u_char *buf)
++{
++	struct bcm53xxsf *b53sf = nor->priv;
++	struct spi_message m;
++	struct spi_transfer t[2] = { { 0 }, { 0 } };
++	unsigned char cmd[5];
++	int cmd_len = 0;
++	int err;
++
++	spi_message_init(&m);
++
++	cmd[cmd_len++] = SPINOR_OP_READ;
++	if (b53sf->mtd.size > 0x1000000)
++		cmd[cmd_len++] = (from & 0xFF000000) >> 24;
++	cmd[cmd_len++] = (from & 0x00FF0000) >> 16;
++	cmd[cmd_len++] = (from & 0x0000FF00) >> 8;
++	cmd[cmd_len++] = (from & 0x000000FF) >> 0;
++
++	t[0].tx_buf = cmd;
++	t[0].len = cmd_len;
++	spi_message_add_tail(&t[0], &m);
++
++	t[1].rx_buf = buf;
++	t[1].len = len;
++	spi_message_add_tail(&t[1], &m);
++
++	err = spi_sync(b53sf->spi, &m);
++	if (err)
++		return err;
++
++	if (retlen && m.actual_length > cmd_len)
++		*retlen = m.actual_length - cmd_len;
++
++	return 0;
++}
++
++static void bcm53xxspiflash_write(struct spi_nor *nor, loff_t to, size_t len,
++				  size_t *retlen, const u_char *buf)
++{
++	struct bcm53xxsf *b53sf = nor->priv;
++	struct spi_message m;
++	struct spi_transfer t = { 0 };
++	u8 *cmd = kzalloc(len + 5, GFP_KERNEL);
++	int cmd_len = 0;
++	int err;
++
++	if (!cmd)
++		return;
++
++	spi_message_init(&m);
++
++	cmd[cmd_len++] = nor->program_opcode;
++	if (b53sf->mtd.size > 0x1000000)
++		cmd[cmd_len++] = (to & 0xFF000000) >> 24;
++	cmd[cmd_len++] = (to & 0x00FF0000) >> 16;
++	cmd[cmd_len++] = (to & 0x0000FF00) >> 8;
++	cmd[cmd_len++] = (to & 0x000000FF) >> 0;
++	memcpy(&cmd[cmd_len], buf, len);
++
++	t.tx_buf = cmd;
++	t.len = cmd_len + len;
++	spi_message_add_tail(&t, &m);
++
++	err = spi_sync(b53sf->spi, &m);
++	if (err)
++		goto out;
++
++	if (retlen && m.actual_length > cmd_len)
++		*retlen += m.actual_length - cmd_len;
++
++out:
++	kfree(cmd);
++}
++
++static int bcm53xxspiflash_erase(struct spi_nor *nor, loff_t offs)
++{
++	struct bcm53xxsf *b53sf = nor->priv;
++	unsigned char cmd[5];
++	int i;
++
++	i = 0;
++	cmd[i++] = nor->erase_opcode;
++	if (b53sf->mtd.size > 0x1000000)
++		cmd[i++] = (offs & 0xFF000000) >> 24;
++	cmd[i++] = ((offs & 0x00FF0000) >> 16);
++	cmd[i++] = ((offs & 0x0000FF00) >> 8);
++	cmd[i++] = ((offs & 0x000000FF) >> 0);
++
++	return spi_write(b53sf->spi, cmd, i);
++}
++
++static const struct spi_device_id *bcm53xxspiflash_read_id(struct spi_nor *nor)
++{
++	struct bcm53xxsf *b53sf = nor->priv;
++	struct device *dev = &b53sf->spi->dev;
++	const struct spi_device_id *id;
++	unsigned char cmd[4];
++	unsigned char resp[2];
++	char *name = NULL;
++	int err;
++
++	/* SST and Winbond/NexFlash specific command */
++	cmd[0] = 0x90; /* Read Manufacturer / Device ID */
++	cmd[1] = 0;
++	cmd[2] = 0;
++	cmd[3] = 0;
++	err = spi_write_then_read(b53sf->spi, cmd, 4, resp, 2);
++	if (err < 0) {
++		dev_err(dev, "error reading SPI flash id\n");
++		return ERR_PTR(-EBUSY);
++	}
++	switch (resp[0]) {
++	case 0xef: /* Winbond/NexFlash */
++		switch (resp[1]) {
++		case 0x17:
++			name = "w25q128";
++			break;
++		}
++		if (!name) {
++			dev_err(dev, "Unknown Winbond/NexFlash flash: %02X %02X\n",
++				resp[0], resp[1]);
++			return ERR_PTR(-ENOTSUPP);
++		}
++		goto found_name;
++	}
++
++	/* TODO: Try more ID commands */
++
++	return ERR_PTR(-ENODEV);
++
++found_name:
++	id = spi_nor_match_id(name);
++	if (!id) {
++		dev_err(dev, "No matching entry for %s flash\n", name);
++		return ERR_PTR(-ENOENT);
++	}
++
++	return id;
++}
++
++/**************************************************
++ * SPI driver
++ **************************************************/
++
++static int bcm53xxspiflash_probe(struct spi_device *spi)
++{
++	struct bcm53xxsf *b53sf;
++	int err;
++
++	b53sf = devm_kzalloc(&spi->dev, sizeof(*b53sf), GFP_KERNEL);
++	if (!b53sf)
++		return -ENOMEM;
++	spi_set_drvdata(spi, b53sf);
++
++	b53sf->spi = spi;
++
++	b53sf->mtd.priv = &b53sf->nor;
++
++	b53sf->nor.mtd = &b53sf->mtd;
++	b53sf->nor.dev = &spi->dev;
++	b53sf->nor.read_reg = bcm53xxspiflash_read_reg;
++	b53sf->nor.write_reg = bcm53xxspiflash_write_reg;
++	b53sf->nor.read = bcm53xxspiflash_read;
++	b53sf->nor.write = bcm53xxspiflash_write;
++	b53sf->nor.erase = bcm53xxspiflash_erase;
++	b53sf->nor.read_id = bcm53xxspiflash_read_id;
++	b53sf->nor.priv = b53sf;
++
++	err = spi_nor_scan(&b53sf->nor, NULL, SPI_NOR_NORMAL);
++	if (err)
++		return err;
++
++	err = mtd_device_parse_register(&b53sf->mtd, probes, NULL, NULL, 0);
++	if (err)
++		return err;
++
++	return 0;
++}
++
++static int bcm53xxspiflash_remove(struct spi_device *spi)
++{
++	return 0;
++}
++
++static struct spi_driver bcm53xxspiflash_driver = {
++	.driver = {
++		.name	= "bcm53xxspiflash",
++		.owner	= THIS_MODULE,
++	},
++	.probe		= bcm53xxspiflash_probe,
++	.remove		= bcm53xxspiflash_remove,
++};
++
++module_spi_driver(bcm53xxspiflash_driver);